c# - 寻找半小时向上/向下的时间选择器控制

Question

我正在寻找一个时间选择器的解决方案，它允许我选择以下内容:

00:30  > 01:00  > 01:30

当它到达 23:30 时，需要回到 0:00。

换句话说，我需要通过选择向上或向下来增加半小时的周期。我已经尝试合并一个 hscroll 栏并修改一个 timepicker 但在我看来这是非常敏感和不必要的，因为我怀疑必须有更简单的方法吗？

任何建议都会很好。

Answer 1

我只是将 DomainUpDown 控件子类化来执行此操作，代码如下:

class TimePicker : DomainUpDown
{
    public TimePicker()
    {         
        // build the list of times, in reverse order because the up/down buttons go the other way
        for (double time = 23.5; time >= 0; time -= 0.5)
        {
            int hour = (int)time; // cast to an int, we only get the whole number which is what we want
            int minutes = (int)((time - hour) * 60); // subtract the hour from the time variable to get the remainder of the hour, then multiply by 60 as .5 * 60 = 30 and 0 * 60 = 0

            this.Items.Add(hour.ToString("00") + ":" + minutes.ToString("00")); // format the hour and minutes to always have two digits and concatenate them together with the colon between them, then add to the Items collection
        }

        this.SelectedIndex = Items.IndexOf("09:00"); // select a default time

        this.Wrap = true; // this enables the picker to go to the first or last item if it is at the end of the list (i.e. if the user gets to 23:30 it wraps back around to 00:00 and vice versa)
    }
}

像这样将控件添加到您的表单中:

TimePicker picker1;

public Form1()
{
    InitializeComponent();

    picker1 = new TimePicker();
    picker1.Name = "timePicker";
    picker1.Location = new Point(10, 10);

    Controls.Add(picker1);
}

然后当我们想要获取选择的时间时(我这里使用了一个按钮)，我们只需使用SelectedItem属性:

private void button1_Click(object sender, EventArgs e)
{
    MessageBox.Show(picker1.SelectedItem.ToString()); // will show "09:00" when 09:00 is selected in the picker
}

DomainUpDown 的文档:http://msdn.microsoft.com/en-us/library/system.windows.forms.domainupdown.aspx